(19)

(11)

EP 0 635 123 A1

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(43) Date of publication: 25.01.1995 Bulletin 1995/04 (21) Application number: 93907714.0 (22) Date of filing: 08.04.1993

(51) International Patent Classification (IPC):  G01M 3/ 04( . ) G01M 11/ 08( . ) (86) International application number: PCT/CA1993/000139 (87) International publication number: WO 1993/021507 (28.10.1993 Gazette 1993/26)

(84) Designated Contracting States: DE ES FR GB GR IT (30) Priority: 10.04.1992 CA 19922065785 (60) Divisional application: 96202432.9 / 0751386 (71) Applicant: NORSCAN INSTRUMENTS, LTD. Winnipeg, Manitoba R2J 4B3 (CA)	(72) Inventors: VOKEY, David, E. Sydney, British Columbia V8L 3X9 (US) SONTAG, Kenneth, N. Winnipeg, Manitoba R2C 2Z2 (CA) KRAFT, Heinrich D-8633 Rodental (DE) (74) Representative: Adkins, Michael, et al  Withers & Rogers 4 Dyer's Buildings Holborn London EC1N 2JT London EC1N 2JT (GB)